Bitttkinotts concrete flooring



Sept. 22, 1931.

L. S. WILBUR BITUMINOUS CNGRETE FLOORING Filed Nov. 25, 1927 l mm?? lcU/U 73C/nw@ 5. ma?? l 7M W5 Patented Sept. 22, 1931 UNITED STATES S. WILBUR, OF EVANSTON, LLINOIS, ASSIGNOR '.l.'0 JOHNS-MANVILLE COBIYORATION, A CORPORATION 0F NEW 'YORK` BITUMINoUs CONCRETE FLOORING Application iled November v25, 1927. Serial Nrn-235,426.

of 17% No. 25 penetration iux; 33% red This invention relates to bituminous concrete flooring, and has for its principal objects to reduce the labor and diiiculty of laying and to improve the finished product.

Further objects and advantages of the invention will become apparent as the descrip- Y tion is read in connection with the accompanylng drawings, in which Fig. 1 is a partial plan viewofa railway car illustrating the various stages in the process of laying bituminous concrete ii'ooring; and

Fig. 2 1s a sectlonal view taken on the line 2--2 of Fig. 1.

g5 It is to be understood that this specific illustration, and the correspondingly specific description, are used for the purpose of disclosure only, and are not intended to indicate the limits of the invention or its uses.

The supporting iioor structu're of the caris illustrated at 10 as being made of corrugated or channel sheet metal, commonly known in the trade as 5/gths yinch fchan arch.v This is suitably. mounted on the frame of the car between the side walls 11 and the end walls 12, and receives the bituminous concrete iooring, general-ly indicated by 13.

The concrete is madei two layers, which will be termed for convenience a base layer 14 (Fig. 2) and a finish layer 15. The following is au illustrative mixture suitable for the base layer.

Eighty-five pounds of standard mastic blocks, which may contain,15% of No.

penetration iiux and 85% of limestone dust and sand to pass 10 to 200 mesh screen; 15 lbs. No. 25 penetration flux; 53 lbs. coke that will pass a 10 mesh screen; and 25 lbs. gravel that will pass 4 to 6 mesh screens.

It will be understood, of course, that the character of the materials will be changed to suit particular conditions.`

For a lighter mixture the gravel may be eliminated and the iiux increased to 22 pounds, and the coke increased to 7 5 pounds.

The iinish layer may he made of the same mixture as the base layer, with the exception that instead of the standard mastic blocks maroon or other colored mastic blocks may be used. A very satisfactory block consists slate dust passing an 8O mesh screen; and ofpulverized red oxide of' iron.

Another satisfactory finish mixture con- In laying the concrete the best results will be obtained by first laying a relatively small portion or area of the base layer and immediately laying thereon a corresponding area of the finish layer, and trowellin or otherwise rolling it to the desired Iinishe surface. For example, in laying carfloors on steel floor supports very satisfactory results are vobtained by first placing about 'two buckets or nine square feet of the base la er, striking it oil with a straight edge 19 ig. 2) notched at the edges 20 t0 correspond with the thicknessof the finish layer and immediately following the strikingl oilz corresponding area of the finish layer kand striking that oil' with a straight edge 21.

Then treat the surface with a float or roller,

or both, according to the conditions.

' After proceeding'in this manner until the' two side areas have been laid, the strips may all be removed and the side areas themselves will perform the functionof strips while the middle area is laid. The marginal areas may be filled in entirely with -the nish material and immediately worked to the nished surface. In ordinary practice car floors are proc vided with a cove or molding around the margins, in which case an excess of concrete is laid in these areas and the .float is applied until substantially all shrinkage has taken place. Y 0

ln car oors such as illustrated bituminous concrete will be suicient if it is an inch and a with one bucket or a quarter thick over the steel floor supports,`

and of this one-quarter' inch only may be int 2 Lesa-aie the finish layer. By laying the finish mixture immediately after laying a small portion of the base :mixture the base layer assists in keeping the finish layer at the proper Work- 5 ing temperature until it can be brought to a finish. Ordinarily thevvconcrete is laid at a temperature of around 400., and it works best when somewhere near that temperature. The steel support being a good conductor of heat l@ tends to rapidly reduce the temperature of the concrete, even at ordinary summer temperatures, and this tendency is greatly increased as the atmospheric conditions change toward normal Winter temperatures. The hot concrete laid next to layers that have already been placed Will cause sucient fusion of adjacent surfaces to bond them firmly together. f

ll claim as my invention- 2a l. rlhe process of laying bituminous concrete floors, which includes laying a layer of hot concrete and immediately placing thereon a layer of other hot concrete and Working the latter to a finished surface. sa 2. The process of laying bituminous concrete floors, which consists in laying a relatively thick layer of hot concrete and immediately laying thereon a relatively thin layer of hot concrete including a coloring agent, 80 and immediately acting upon the relatively thin layer to produce a finished surface.

3 'lhe process of laying bituminous concrete floors, which includes laying a small area of hot concrete of less thickness than the ,36 finished floor, and immediately laying thereon a layer of hot surface concrete and immediately rolling the thin layer 'to a finish.

4. rlhe process of laying bituminous concrete floors, whi h includes laying a layer of 40 hot concrete and immediately placing thereon a layer of other hot concrete While the first layer is at a temperature to prevent the second layer from becoming too cool for finishing and Working the latter to a finished surface. s Y

5. The process of laying bituminous concrete floors, which includes laying a small area of hot concrete of less thickness than the Y finished floor, and immediately laying thereon a layer of hot surface concrete While the first layer is at a temperature to prevent the second layer from becoming too cool forv finishing and immediately rolling the thin layer to a finish. 6. The processof laying bituminous con crete floors, which includes laying a layer of hot concrete and striking off said layer` then l. immediately applying another layer of con- 'crete on the first layer While it is still hot so e0 that the heat of the first layer will assist in maintaining the temperature of the second layer, and immediately rolling the second layer while hot to a finished surface.

In testimony whereof I affix my signature.

5 LAWRENCE s. WILBUR. 

